PRotein Ontology (PRO) Release 52.0 (07-Apr-2017)

There are 213457 PRO terms in the Protein Ontology.
   59 terms are in the 'external' category.
   83 terms are in the 'organism-seqgroup' category.
   404 terms are in the 'family' category.
  23571 terms are in the 'gene' category.
  8331 terms are in the 'sequence' category.
  6678 terms are in the 'modification' category.
   212 terms are in the 'complex' category.
   34 terms are in the 'organism-family' category.
  97147 terms are in the 'organism-gene' category.
  69524 terms are in the 'organism-sequence' category.
  6462 terms are in the 'organism-modification' category.
   385 terms are in the 'organism-complex' category.
   121 terms are in the 'union' category.
2514 terms have some kind of annotation, codifying the information from 1674 papers.
  4419 connections to GO (1711 PRO terms).
   292 connections to MOD (255 PRO terms).
   616 connections to Pfam (369 PRO terms).
   338 connections to SO (317 PRO terms).
   349 annotations of a phenotype (342 PRO terms).

The ontology includes a subset of terms from other ontologies and resources that are used for logical definitions.